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  #1  
Old 03-20-2007, 10:58 AM
scoodidabop's Avatar
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Join Date: May 2006
Location: Houston, TX
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Glow plugs... You tell me...

My glow plug light is not coming on. I tested all the plugs, and #4 was not giving me a continuity reading. I replaced it. All the wires from the relay to the plug are giving me a good reading. All the other plugs are giving me a good reading. The fuse on the relay checks out. I've got 12v running from the relay to the 5 glow plug output pins. Whenever I unplug the plug wires from the relay, I get the glowplug light via turning the key, so it's not the bulb...

When I'm in the car, with the come light on, the dome light dims until I hear the relay kick off, so I know the plugs are drawing some power.

What am I missing here?

BTW 1982 300TD.

Thanks
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  #2  
Old 03-20-2007, 11:01 AM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
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Do you have a spare relay to test with?
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70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

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  #3  
Old 03-20-2007, 11:12 AM
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At this point I would bench test the GPs or pull the injectors and actually look down the hole. I've had GPs pass the continuity reading but still be bad.
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1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
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2014 Kubota L3800 tractor
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Old 03-20-2007, 05:12 PM
scoodidabop's Avatar
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I don't have a spare relay....

I might just replace the other 4 GPs
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'90 300SE --- 173k miles --- (Odometer just stopped working!)

'85 Cali 300D --- 193500 miles --- (Second one) Sold Nov '10

'82 300TDT --- 236,xxx miles --- (My first one) Sold July '09
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  #5  
Old 03-20-2007, 05:37 PM
Stevo's Avatar
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Quote:
Originally Posted by scoodidabop View Post
I don't have a spare relay....

I might just replace the other 4 GPs
Sounds like the best plan, bench test what you take out and keep the good ones for spares.
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1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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